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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45faa7f2d90a30334e35f8961aa8a61a3c0b8ec7bf3265a043219117f680cf27' 
  AND token = '5l7UwAc7WFh41kwnoNamb401QiipKrUz3GZE9/oPb6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}